Not everyone lives in the Northern Hemisphere (well, at least not me ) so the moon phases in this hemisphere are "upside down" . Using the moonphases.png, i modify it to show how actually the view is (only a 180º rotating for every frame).

You could add an option inside the window to select the hemisphere (0: northern 1: southern, or in the other way, for me is the same thing) and show moonphases_north.png or moonphases_south.png...